Electric signaling device.



v Patented Apr. 22, NH3

GILBERT CHRISTIAN, OF DETROIT, MICHIGAN, ASSIGNOB TO THE WILCKlElf-ARMSTRONG COMPANY, OF DETROIT, MICHIGAN, A CORPORATION 0F MICHIGAN.

ELECTRIC SIGNALING DEVICE.

`Speeilcacion of Letters Patent.

Patented Apr. 22, 191 3.

Application led `Tuly 8, v19152. Serial No. 708,089.

To all whom t'may concern.'

Be it known that I, GILBERT CHRISTIAN, a citizen of the United States,and a resident of Detroit, county of \Vayne, and State of Michigan, haveinvented a new and I mproved Electric Signaling Device, of whlch thefollowing is a specification.

This invention relates to electrically operated means for strikinggongs, bells or other resonant bodies for the purpose of producingsounds of a predetermined character, and its object is .to provide aslgnal operating device vwhich will freely operate under proper electricimpulses, but cannot be caused to produce the predetermined soundsthrough the shaking, strikingv or other sudden movements of the casecontaining the signaling device.

This invention consists in combination with a resonant body and asupport therefor, of an electro-magnet mounted ad]acent thereto, ahammer pivotally mounted intermediate its ends, a resiliently mountedarmature for the magnet, and an arm connecting to the magnet armatureand engaging the hammer in such a manner that the energizing of themagnet will cause the arm on the armature to swing the hammer againstthe resonant body. p

In the accompanying drawing Figure l 1s a plan of this improvedmechanism with the resonant bodies removed. Fig. 2 is an elevation ofthe complete device. y Similar reference characters refer to like partsthroughout the several views.

Electric signals for use in connection with telephone pay stations andsimilar purposes are often sounded by strikin the boxes in which thesignaling mechanlsms are contained, and at times, by turning the boxesupside down. To revent such unauthorized operation of slgnals of thistype,.the present construction is so designed that the strikingmechanism is securely held from contacting with the sounding mechanism,except when properly actuated by its. electro-magnet. In theaccompanying drawing, a duplex signal is shown, but it will beunderstood that. each side acts independent of the other, and eachembodies the entire invention.

The supporting portion off this devicel comprises a plate 1, an upright2 and a ver tical plate 3, on which support the ong 4 and bell 5 aremounted. Any other esired type of support or sounding devices may beemployed. An electro-magnet 6 is mounted on each side'of a post 7, ontothe top of which is secured a spring 8 which normally holds t-hearmatures 9 out of contact with the cores 10, and liftsvthese armaturesout of such contact after the magnets are deenergized. Posts 12 havetheir upper ends slotted andcarry pivots 13, on 'which the hammers 14are mounted. These hammers are formed with jaws 15, between which theouter ends of the arms 16 extend, which arms are secured to thearmatures, as shown in Fig. 2. The hammers have heels 171 to limit theirdownward movement. Wires 19 connect to their respective magnets, whilethe return wire 20 preferably connects to both magnets.

, 'It will be observed that when a magnet is energized sufficiently toattract an armature, that the arm presses down the jaws 15 and swings upthe hammer 14 a ainst the gong or bell, as shown in dotte lines in Fig.2, but that the spring 8 will resist such movement at all other times.

In the drawings a bar 22 of suitable material such as soft. iron or mildsteel is mounted in the support with the cores 10 and the post 7 ofsimilar material secured thereto, but it should be understood that theentire support may be of such material, and may be given any desiredform.

By the construction of the post 7, the core 10, and aconnecting member,such as the bar 22, as well as,the armature of readily magnetizable anddemagnetizable material, a powerful magnet-ic field is produced in thenarrow air gap between the core of the magnet 6 and the armature 9 'whenthe electromagnet 1s energized. This permitsthe use of a singleelectro-magnet to actuate the armature where twoof thesame size areusually employed. It also permits thel use of'less material to completethe electro-magnetic circuits between they various parts. Thl'sconstruction also permits the mounting of electro-magnets and bells inany desired number of lines radiating Jfrom the postr?.

The details and proportions of all these parts'may be modified orchanged by skilled electricians without departing from the spirit of myinvention as set forth in the claims.

I claim- 1. Inr an electric signaling device, the combination of aresonant body, an. electromagnet, a hammer provided with a pair of jaws,a pivot forsaid hammer, an armature for the magnet, a spring supportingthe armature and 'normally holding it out `of engagement with themagnet, and an arm connected to the armature and extending be tween thejaws of the hammer so it may swing the hammer against the resonant bodywhen the magnet is energized, the hammer being so ivoted that its weightis opposed by that o the armature. Y

2. In an electric signaling device, the combination of a support, aresonant body mounted thereon, an electro-magnet and a post mounted onthe support, a hammer pivotally mo1nted on said post and having aprojection to limit its movement in one direction and a pair of jawsextending toward lsaid electro-magnet, an armature for theelectro-magnet, a spring to carry the same and to normally hold it awayfrom the electro-magnet, a support for the spring, and an arm connectedat one end to the armature and having its free end extending between thejaws of the 1hammer so'that an operative movement of the armature willswing' the hammer against the resonant body.

In testimony whereof I have signed this specification in the presenceof` two subscribing witnesses.

4GILBERT CHRISTIAN.

Witnesses: EDWARD N. PAGELSEN,

HUGO W. KREINBRING.

